The FHS series laser source, an advanced version of DLS-3a with more functions, offers excellent stability and portability for accurate fiber optic testing. A single output port provides stable laser power at dual wavelength. The compact unit operates in either continuous wave (CW) mode or modulated mode. A low battery indicator reminds the user to replace the battery.

The FHS2D02 and FHS2D03 units can transmit with a wavelength-identification digital encrypted protocol,enabling the FHP2 power meter to automatically use the proper calibration parameters. This feature reduces the need for communication between the two technicians and decreases the potential for error.

The output power is adjustable through up-and-down keystrokes.